\\[-1.8ex] Soil Heterogeneity & $-$0.660$^{***}$ & $-$0.623$^{***}$ & $-$0.382$^{***}$ & $-$0.371$^{**}$ \\ 
  & (0.221) & (0.218) & (0.143) & (0.144) \\ 
\\[-1.8ex] 
Observations & 4,785 & 4,785 & 2,038 & 2,038 \\ 
R$^{2}$ & 0.357 & 0.395 & 0.368 & 0.369 \\ 
